Carbureter.



H. N. MOTSINGER.

` CARBURETER.

APPLICATION FILED lUNE19, 1914. 1,165,359. Patented Dec. 21, 1915.

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PAT

nr Veinen.

HOMER N. MOTSINGER, F LA FAYETTE, INDIANA.

CARBURETER. l

Specification of Letters Patent.

Patented nemer, reis.

Application led June 19, 1914. Serial No. 846,019.

Triall whom t may concern.'

Be it knownthat I, HoMnR N. MoTsINGER,

' a citizen of the United States, residing at primary air inlet and a secondary air inlet,

and the fuel nozzle is located in the path of the primary air so that the fuel is picked up by 'such primary air to produce the initial mixture, this initial mixture then being mixed with the secondary air to produce the nal mixture, and the supply of this final mixture to the engine being controlled by a throttle valve. With this type of carbureter, or, in fact, in any type, it is highly desirable to finely subdivide, or nebulize, the fuel andin order to do this, someform 0f nebulizing nozzle has been `found to be satisfactory if a suficientlyk high velocity of air is maintained across such nozzle, but diliiculty has heretofore been found in producing the desired air velocity at low speeds ofthe engine without producing an eXces-" sive throttling at high speeds of the engine` under light loads. v

The object of my present invention is, therefore, to provide a` construction in which desired air velocities at low engine speeds can be produced without limiting` the maximum capacity of the carbureter. I accomplish this by reducing the proportion of secondary air to primary air as the throttle valve is moved toward closed position, and making this reduction dependent on the increased vacuum produced beyond' the throttle valve as it is so moved. In

other words, increase of vacuum above the throttle automatically increases the vacuum below the throttle but without a corresponding opening of the air valve. ln the preferred form of my invention, I provide an automatic valve controlling the secondary air inlet and connect this valve to lcontrol-A ling means, such asa cylinder and piston, responsive touthe pressure, or vacuum, beyond. the throttle valve.

The accompanying drawingfillustratesmy invention, the single figure being a vertical section through a carbureter embodying my invention. E

The 'fuel nozzle 10, shown `as supplied with fuel from a fuel bowl 11 in whlch a constant level of the liquid fuel is main'- tained by the float 12 'and the valve 13 operated thereby, is located in the`primary air passage 14, the other end 15 of which discharges to a vertical tube or passage 16, the lower end of which is also connectedv to the secondaryV air passage 17. ,The throttle valve 18 is located in the tube 16. The inlet to the secondary .air passage 17 iscontrolled by a valve 19,-which is shown as connected, by mechanism 20 the details of which are not essential to this presentap- Y plication, to the valve 21 of the fuel nozzle, so that the two valves 19 and 21 open and close together. The valvestem'22 of the valve 19 is connected to ra piston v23 slidable in a cylinder 24, the upper end of'said cylfj lnder belng open to the atmosphere andthe" Lower end being connected by a pipe 24s to the explosive-mixture passage.

In operation, the engine will produce a vacuum in the passage 16 which willl be practically equal on bothl sides 'ofl valve 18, and there will be somev small suction effeet tending to draw piston 23 downwardl which, acting upon the air valve 19, will tend to hold that valve toward its closed position .but,`as the area of pistonisless than thatof valve 19, and as pipe 24is comparatively small, this eHect is neither 'evspecially noticeable or objectionable. v Inl this condition of the parts, such a proportion of air will be drawn through the primary air passage 14 as to givelthat air a satisfactory velocity as it'passeszthe fuel nozzle. Where valve 18 is swung toward itsclosed position, the vacuum on theengineside,of the valve is, of course, greater Athan that on .the can bureter side and this condition,v` in the'common forms of carbureters of this type, results in a .decrease yin velocity of the air passing through the primary Yair passage 14: and a consequent decrease in the nebulizing effect ofthat air on the fuel., In. ny present` construction, however, the relative increase of vacuum onthe engine side of" of that airV past the fuel nozzle, with a cor` responding increase in the nebulizing effect on the fuel.

I claim as my invention: 1. In a carbureter, the combination of a 5 primary air passage, a fuel nozzle therein, a

' se'condary air passage, an air valve controlling the flow of air through said secondary 'air passage, a fuel valve controlling the supply of fuel tothe fuel nozzle and connected to said air valve to be operated therewith, a mixture'passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of thepoint where the secondary air passage discharges thereinto, and means responsive to the pressure in said mixture passage on the discharge side of said throttle for controlling said air valve.

2. In a carbureter, the combination of a primary air passage, a fuel nozzle therein, a secondary air passage, a` valve controlling the -low of air through said secondary air passage, a mixture passage to which both said primary air passage and said secondary air'passage discharge, a throttle in said ,mixture passage on the discharge side of the point where the secondary air passage discharges thereinto,`and means responsive to the pressure in said mixture passage on the' discharge side of said throttle for controlling said valve.

3. In a carbureter, the combination of a primary air passage, a fuel nozzle therein,

a secondary air passage, an `air valve controlling the flow of air through said secondary air passage, a fuel valve controlling the supply of-fluel to the fuelnozzle and connected to said air valve to be operated therewith, a mixture passage to which both said primary air passage and said secondary air i. passagel discharge, a throttle in said mixture lpassage on the discharge side of the point wherethe secondary air passage discharges thereinto, a cylinder and piston one of which t5 is mechanically-connected to said air valve, and a pneumatic connection between said cylinder and said mixture passage on the discharge side of said throttle.

el. In a carbureter, the combination of a` v primary air passage, a .fuel nozzle therein,

- a secondary air passage, a valve controlling the flow of air through said secondary airpassage, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the' discharge side of the point where the secondary air passage discharges thereinto, "a cylinder and pistonone of which is mechanically connected to said 00 valve, and a pneumatic connection between said cylinder and said mixture passage on the discharge side of said throttle.

5. In a carbureter, the combination of a primary air passage, a fuel nozzle therein.

' a secondary air passage, an air valvecontrolling the flow of air through said secondary air passage, a fuel valve controlling the supply of fuel to the fuel nozzle and connected to said air valve tog-be operated therewith, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of the point where the secondary air passage discharges thereinto, -a chamber having a movable wall connected to said air valve, and a pneumatic connection between said chamber and said mixture passage on the discharge side of said throttle. v

6. In a carbureter, the combination of a primary air passage, a fuel nozzle therein, a secondary air passage, a valve controlling the flow of air through said secondary air passage, a mixture passage to which both said primary air'passage and said secondary 85 air passage discharge, a throttle in saidmixture .passage on the discharge side` o-f the point where the secondary air passage discharges thereinto, a chamber having a movable wall connected to said valve, and a pneumatic connection between said chamber and said mixture passage on the discharge side of said throttle.

7. In a carbureter, the combination of a primary air passage, a fuel nozzle therein, a 96 secondary air passage, a valve controlling the flow of air through said secondary air passage, a fuel valve controlling the supply of fuel to the fuel nozzle and connected to said air valve to be operated therewith, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of the point where the secondary air passage .discharges thereinto, a chamber having a movable wall connected to said air valve, and a pneumatic connection `other than the aforesaid passages between said chamber and said mixture passage, said chamber being'closed save for such connection.

8. In a.' carbureter, the combination of a primary air passage, a fuel nozzle therein, a secondary air passage, a valve controlling the flow of air through said secondary air passage, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of the point where the seconda-ry air passage dis-V charges thereinto, 'a kcylinder and piston one Y of which is mechanically connected to said valve, and pneumatic connections between said cylinder on opposite sides of said piston to the atmosphere and to the-mixture passage on the discharge side of the throttle respectively.

9. In a carbureter, the combination of a primary air passage, a fuel nozzle therein, a secondary air passage, an air valve control- 130 menace 10. In aI carbureter, the combination of a prlmary air passage, a fuel nozzle therein, a secondary a'rr passage, a valve controlling the flowof air through said secondary air passage, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of the point where the secondary air passage dis- -charges thereinto, and means connected to said valve and tending to close it in proportion to the vacuum in said mixture passage y on the discharge side of the throttle.

- 11. In a carbureter, the combination of a primary air passage, a fuel nozzle therein, a secondary air passage, a suction-controlled valve controlling the flow of air through said secondary air passage vand tending to open as the suction increases in said secondary air passage, a mixture passage to which both said vprimary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge sidel of the point where said secondary air passage discharges thereinto, means respon'- s1ve to the vacuum in said mixture passage on the discharge side of said throttle'and tending to close said suction-controlled valve with a force which varies as such vacuum on the discharge side of said throttle, and a fuel valve controlling the supply of fuel to the fuel nozzle, said fuel valve and said suction-controlled valve being interconnected so as to operage together.

12. In a car primary air passage, a fuel nozzle therein, a secondary air passage, a suction-controlled valve controlling the flow of air through said secondary air passage and tending to open as the suction increases in said secon ary air passage, a mixture passage to which both said primary air passage and said secondary air passage discharge', a throttle in said mixture passage on the discharge side of the point where said secondary air passage discharges thereinto, and means. responsive to the vacuum in said mixture passage on the discharge side of saidthrottle and tending to close said suction-controlled valve with a force which r'varies as such vacuum on the discharge sideV of said throttle;

13. In a carbureter, the combination of a and means connected to said yair ureter, the combination of a primarg7 air passage, a fuel nozzle therein, a secondary air passage,'a valve controlling the flow of air through passage, amixture passage to which both said prlmary air passage and said secondary a1r passage discharge, a throttle in-said mixture passage on the discharge side of thepoint where said secondary air passage dischargesthereinto, a chamber having a movable wall, a pneumatic connection between said'chamber and said mixture passage on Vthe discharge side of 'said throttle, and a connection between said movable wall and said valve so that the movement of the wall as the pressure in such chamber decreases tends to close such valve.

14. In a carbureter, the combination of a primary air.passage,pa fuel nozzle therein,

said secondary air i a secondary air passage, a valve controllingthe flow passage, a mixture passage to which both said primary air passage and said secondary air passage discharge, a throttle in said mixture passage on the discharge side of the point where saidv secondary air passage discharges thereinto, a chamber having a movable Wall, a. pneumatic connection between said chamber and said mixture passage on the discharge side of said throttle, and a connection between said movable wall and said valve so that the movement of the wall as the pressure in such chamber decreases tends to close such valve, said valve being mounted in said secondary air passage so that it tends to open as the suction in said secondary air passage increases.

15,'In a carbureter, the combination of a primary-air passage, a fuel nozzleV therein, a secondary air passage, a mixture passage to which both said primary air passage and said secondary air passage discharge, a manually operated throttle and an automatic valve both controlling the passage of air through .said secondary air passage, said.v

throttle being located on the discharge side of said automatic valve, and means res onsive to the vacuum on the discharge si e of said throttle and tending to close said automatic valve with a force which varies as such vacuumon such discharge side of the throttle, said automatic valve tending to openas the vacuum increases on the intake side of said throttle.

16. In a carbureter, the combination .of a

:primary air passage, a fuel nozzle therein, a

secondary air passage, a mixture passage to which both said primary air Bpassage and said secondary air passage disc arge, a manually operated throttle 'and an automatic valve both controlling the passage of air through said secondary air passage, said throttle being located on the discharge side of said automatic valve, and means respon- "sive to the vacuum on the discharge side of said throttle and tending to close said autoof air through said secondary airmatic valve with la force which varies as such Vacuum on such dlscharge side of the throttle.

17. In a carbureter, the combination of a fuel nozzle, a throttle valve, an air inlet valve on the inlet side of said" throttle valve and controlling a 'supply of air thereto, said air inlet valve tending to open as the suoi' tion on the inlet side of the throttle valve increases, and means responsive to the vacuum on the discharge side of said throttle Valve and tending to close said inlet Valve With a force which varies in the same sense as the vacuum on the discharge side of said throttle valve.

18. In a carbureter, the combination of a fuel nozzle, a throttle Valve, an air inlet valve on the inlet side of said throttle valve and controlling a supply of air thereto, and means responsive to the vacuum on the discharge side of said throttle valve and tending t'o close said inlet valve with a force -which varies in the same sense as the vacuum on the discharge side of said throttle valve. .19. -In a carbureter, the combination o f a fuel nozzle, a throttle valve, an air inlet valve on the inlet side of said' throttle valve and-controlling a supply of air thereto, said air inlet valve tending to open as the suction on the inlet side of the throttle valve increases, means responsive to the vacuum on the discharge side of said throttle' valve and tending to close said inlet valve with a force which varies in the same sense as the vacuum on the discharge side of said throttle valve, and a fuel Valve controlling the supply of fuel to said fuel nozzle and connected to said air inlet valve so as to be operated therewith.

'20. In a carbureter, the combination of a fuel nozzle, a throttle valve, an air inlet valve on the inlet side of said throttle valve and controlling a supply of air thereto, and" means. responsive to the vacuum on the discharge side of said throttle valve and tending to close said inlet valve with a force which varies in the same sense as the vacuum on the discharge side of said throttle valve, and a fuel valve oontrolling'the supply of fuel to said fuel nozzle and connected to said air inlet valve so as. to beoperated 

